Improvement in rotary pumps



militante' l jrRANcIs'oLIvnR nEscHAMPs, orxrHrLADELPHIA, PENNSYLVANIA.

Leiiersraenr No.v 112,429, dated Maan-7, 1811.

IMPROVEMENriNRoTARv PuMPs.

y I, FRANCIS OnIvnR DnscHAMrs, of Philadelphia,

county of Philadelphia, State of Pennsylvania, `have Iinvented an `Improved Rotary'lump,'of` `which the following is a specification.` i l Nature Objectf'of the Invention.

llylyinventioh consistsofa rotary pump,the princi-y pal features of whicharean `annular chamber, a pis# tonladaptedto the same and connected to a shaft arranged to revolve concentricallyae regards the chamber, a sliding `head to mve across' orgrece'de from the said L chamber, and suction" and `discharge-valves `and pasgsages, all being constructed and'arrangedas fully dei scribed hereafter.l l

` Descrr'qitinof `thief ccnhtpanyfing Drawing.

Figure 1 is an exterioryiew of my improved .1 otary t pump Figure 2, a view of thefsame partly in section, and

` with one-half of the casing removed; i

Figure 3,21. perspective view of part of f'gi2, showi ing the working parts iu'a different position Figure 4, a 'transverse vertical section ofthe pump Figure 5, a detached vieivrof part of lig. 4, drawn to V' l` GenealQDesc/ription. l i The `casing -of thefpuinpf consists f two circular d `plates,A and Agfof cast metal,securedltogether by "bolts, a, and 'having'iformedbetween them, haltI inV 4 one platteland `half in theother, a semicrcular passage, B, and an .annular chamber, B', in which slides apiston, C, `attached tothe` edge of a disk, D,'whicl1 `is hungto the driving-shaft .FJ

. The casing of therpump can be castwithl a base, or it may be secured to any suitable stand or frame, on which can also` be formed bearings for the l driving"- .Shaft F.` l l The piston O consists of a number of independent rings ordisks strung upona rod, as fully described in my application for a `Rigi-,ent for a steam-engine, the

object of which arrange ent is to enable the said pistonto accommodate itself to the annular chamber in which it slides, and thus prevent leakage.

` i/Leakage'iiom the annular chamber around the `edge of the disk D, to which `the pistonis attached, is also prevented in a manner simiIarto-that described in my said application for astealnfengine, by adjustable rings, e G G, having Y-shaped edges, which force rubber or other suitable packing, aa, intothe space between e the said' disk and the recess `communicating with the annular chamber.

. The semicircnlar` passage Bin the casing commu- I nicates freely at its upperend Withthe interior of the ThecSchedule referred to in these'I-etters Patent making part of the same.

annular chamber B', and at its lower end with abranch, V

H, furnished with a poppet-valve, b, opening. upward;

and the said annularrchamber communicates, through a passage, c, with a chamber, J, formed'in a box secured to or forming part of the easing of the pump. i A't the entrance ofthe chamber-J there is a poppetl valve, d, opening upward, and the said chamber has -;one or more outletopenin`gs, aand communicates at the top with the interior of au air-chamber, K.

The upper portion ofthe casing of the pump is enf i larged, as best observed in figs.4 and 5, so as to form fa nari-ow elongated recess, fii'orV the reception of a sliding head or valve, M, which'V extends transversely across theannular chamber B', as shown in figs. 2 and `3; This sliding head or valve has a solid portion, x,'

which, when brought opposite the `annular chamber,

`forms a head or partition across the same; and it has also an opening, x', through which, when it is brought opposite ythe said chamber, the pistonv Ccan freely pass'. In `some cases, however, the opening x in the sliding head might be dispensed with and the said head be reduced in length, so as to enable it to be entirely 'Withdrawn' from the annular chamber in order to permit the passage of the piston. i

`The sliding head is provided with a rod, g, which is connected to one end of a spring-bar, P, secured at its opposite end to the pump-casing. This spring-bar has an inclined projection, h', of the' shaft F, in such a man- Vner as to cause the said spring-bar to be pushed out Y ward, and the 'sliding head to `be consequently drawn back or opened, as shownv in lig. 3; and the said inclined projection and cam are of such a shape as to permit the bar, after the passage of the cam, to spring suddenly inward, 'and thus close the head or valve, as

shown in iig. 4. v

A spring, i,.g. 5, secured to the casing, .acts constantly on the upper edge ol' the `sliding head and forces the latter downward, and this prevents any leakage beneath the lower .edge of the same.

. When the shaft F, disk D, and piston O are turned in thedirection of the arrow l, fig.. 2, the head"M being closed, the suction-valve b will be raised from its seat and the water or otherfluid vto be pumped will pass' through the branch H and semicircular passage B into the chamber. B', behind the piston and between the latter and the sliding head. At the same time the water in lfront oi' the piston within the annular chamber will be forced through the passage c and heneath the discharge-valve d into the chamber J, and

thence through the outlet-branches e c.

As thepiston approaches the slidingv head the latter will be drawn'hack, as shownin lig. 3, so that it may not be struck by the piston, and after the passage v ofthe latter the head will be closedsuddenly, as above described, and another' volume of water will be forced through the annular chamber and passage c to the point of discharge, as before, the operation being continued uninterrnptedly so long as th'e shaft Fis revolved, as the suction and dischargewalves b andd prevent the return of any iuid from either the passages B or chamber J Claims.

1. A pump, in which are combined the following features,namely, an annular chamber, a piston adapted to the same and connected -toa shaft arranged to revolve concentrically as regards the chamber, a sliding head to move across or recede from the saidchamber, and suction and discharge-valves and passages, all being arranged substantially as described.

2. In a` pump, the sliding head M, adapted to a recess, f, Vin the-casing, and operated by a rod, g, or its equivalent, in such a manner that it shall be caused to move across and recede from the annular chamber B', as set forth.

v witnesses.

3. The said sliding head, when operated by a cam, 71', on the driving-shaft, through the medium of a spring-bar, P, and rod g, substantially in the manner described.

4. The combination and arrangement, substantially 'as described, ofthe inlet-branch H, semicircular passage B, annular chamber B', through which a piston traverses in one direction, and outlet-passage O.

5. The'easing of fthe pump, consisting of plates A and A', bolted or otherwise secured together, and hav: ing formed between them the semicircnlar passage B, annular chamberB" communicating with the-same, and recess for securingthe edges of' the disk G.

vIn testimony whereof I have signed my name to this specification in the presence of two subscribing F. O. DESCHAMPS. Witnesses:

`WM. A. STEEL,

HARRY SMITH. 

